Another thing Im trying to fix is The AC / Heater. When I turn the AC or Heater on it works fine, except when Im behind another car. When Im at a light and behind another car I get a horrid smell (much worse than exhaust) into the cabin. Im trying to figure out what this is. The only problem is I dont know where the air come from for The AC system. I believe the filter is behind the glove compartment (going to check that). Any ideas what this could be? Also where does the air come from? Air Intake Manifold (I thought this is only for the engine)?

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